摘要
为得到适用于土体的热导率模型,利用软件将土样扫描电镜图片(反映土体的真实结构)二值化,采用瞬态传热分析方法对土体进行二维传热分析,通过ANSYS模拟土体并分析得出土体热导率。并且将数值分析结果与实测结果进行对比,发现两者间误差较小,说明该方法能较精确地得到土体热导率,为土体热导率理论模型的建立提供了一种新方法。在此基础上,对粉砂、粉土及粉质粘土的热导率进行研究,发现土体热导率随孔隙率的增大而减小,粉砂热导率的减小速率最大,其次为粉土,最小为粉质粘土。
To get the suitable model of soil thermal conductivity, the SEM imagines of soils, which reflect the real soil structure could be digitized, and all the properties of components were given. Hence, the imagines could be analyzed and the effective thermal conductivity of soils could be given through thermal analysis. And it was found that the new method discussed in this paper is suitable for silty sand which is of large particles. The simulated results and the experimental results were compared. It was found that the thermal conductivity of soil decreases with porosity. The decrease rate of silty sand is maximum, and the decrease rate of silty clay is minimum.
出处
《地质论评》
CAS
CSCD
北大核心
2009年第4期598-605,共8页
Geological Review
基金
国家自然科学基金资助项目(编号40802171)
江苏省自然科学基金资助项目(编号BK2007145)
教育部首批"新世纪优秀人才"支持计划资助项目(编号NCET-04-0454)的成果
国际科技合作项目(编号2009DFA2680)
关键词
热导率
扫描电镜
土体结构
数字建模
孔隙率
thermal conductivity
SEM
soil structure
digital modeling
porosity
